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SubjectRe: Updated git HOWTO for kernel hackers
Linus Torvalds wrote:
> How about this patch? Then you can say
>
> git-apply --stat --summary --apply --index /tmp/my.patch
>
> and it will not only apply the patch, but also give a diffstat and a
> summary or renames etc..

Quite nice.



>>I usually want just two things:
>>
>>1) browse the log
>>
>>2) list changes in local tree that are not in $remote_tree, a la
>> bk changes -L ../linux-2.6
>>
>>I agree that seeing the merge csets is useful, that is why [being
>>ignorant of 'git log'] I used git-changes-script.
>
>
> For (1) "bk log" is good.

Chuckle. What does one call a Freudian slip, in computer-land?


> For (2) you'll have to use your own script, or
> just have the remote tree as a branch in the same tree, in which case you
> can do
>
> git log remotebranch..mybranch

Very neat. That makes some things a bit easier, since I usually carry a
'vanilla' branch as .git/refs/heads/master, and do all my modifications
on other branches.

FWIW, git-changes-script (attached) facilitates #2 for me right now. I
use it just like BK's '-L' feature:

cd netdev-2.6
git checkout -f ieee80211
git-changes-script -L ../linux-2.6 | less

That will produce the same output as the feature you just taught me,

git log master..ieee80211

WARNING: You have previously called git-changes-script quite ugly (not
surprising), and this 'git log x..y' will probably replace it in my
usage, long term.

Jeff


#!/bin/bash
#
# Make a log of changes in a GIT branch.
#
# This script was originally written by (c) Ross Vandegrift.
# Adapted to his scripts set by (c) Petr Baudis, 2005.
# Major optimizations by (c) Phillip Lougher.
# Rendered trivial by Linus Torvalds.
# Added -L|-R option by James Bottomley
#
# options:
# script [-L <dir> | -R <dir> |-r <from_sha1> [ -r <to_sha1] ] [<sha1>]
#
# With no options shows all the revisions from HEAD to the root
# -L shows all the changes in the local tree compared to the tree at <dir>
# -R shows all the changes in the remote tree at <dir> compared to the local
# -r shows all the changes in one commit or between two

tmpfile=/tmp/git_changes.$$
r1=
r2=

showcommit() {
commit="$1"
echo commit ${commit%:*};
git-cat-file commit $commit | \
while read key rest; do
case "$key" in
"author"|"committer")
date=(${rest#*> })
sec=${date[0]}; tz=${date[1]}
dtz=${tz/+/+ }; dtz=${dtz/-/- }
pdate="$(date -Rud "1970-01-01 UTC + $sec sec $dtz" 2>/dev/null)"
if [ "$pdate" ]; then
echo $key $rest | sed "s/>.*/> ${pdate/+0000/$tz}/"
else
echo $key $rest
fi
;;
"")
echo; cat
;;
*)
echo $key $rest
;;
esac

done
}

while true; do
case "$1" in
-R) shift;
diffsearch=+
remote="$1"
shift;;
-L) shift;
diffsearch=-
remote="$1"
shift;;
-r) shift;
if [ -z "$r1" ]; then
r1="$1"
else
r2="$1"
fi
shift;;
*) base="$1"
break;;
esac
done

if [ -n "$r1" ]; then
if [ -z "$r2" ]; then
showcommit $r1
exit 0
fi
diffsearch=+
remote=`pwd`;
tobase="$r2";
base="$r1"
fi

if [ -z "$base" ]; then
base=$(cat .git/HEAD) || exit 1
fi

git-rev-tree $base | sort -rn > ${tmpfile}.base
if [ -n "$remote" ]; then
[ -d $remote/.git ] || exit 1
if [ -z "$tobase" ]; then
tobase=$(cat $remote/.git/HEAD) || exit 1
fi
pushd $remote > /dev/null
git-rev-tree $tobase | sort -rn > ${tmpfile}.remote
diff -u ${tmpfile}.base ${tmpfile}.remote | grep "^${diffsearch}[^${diffsearch}]" | cut -c 1- > ${tmpfile}.diff
rm -f ${tmpfile}.base ${tmpfile}.remote
mv ${tmpfile}.diff ${tmpfile}.base
if [ $diffsearch = "-" ]; then
popd > /dev/null
fi
fi

[ -s "${tmpfile}.base" ] || exit 0

cat ${tmpfile}.base | while read time commit parents; do
showcommit $commit
echo -e "\n--------------------------"

done
rm -f ${tmpfile}.base
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